Samsung WA31273A Technical Manual page 91

6-6-5-1 Normal DMA transfer
Initialize DMA
BSY=0
6-6-5-2 Aborted DMA transfer
Initialize DMA
BSY=0
6-6-5-3 Aborted DMA Command
Initialize DMA
BSY=0
WA31273A / WA32543A / WA33203A / WA32163A / WA31083A / WA32162A 6-47
Command
BSY=1
Command
BSY=1
Command
BSY=1 BSY=1
AT INTERFACE and ATA COMMANDS
DMA data transfer
BSY=x
DRQ=x
DMA data Reset DMA
BSY=x BSY=1
DRQ=1 nIEN=0
Reset DMA Status
BSY=0
nIEN=0
Reset DMA Status
BSY=1 BSY=0
nIEN=0
Status
BSY=0